Knud knudsen



K. KNUDSEN.

INCLOSED SWITCH.

APPLICATION man we zz, 191e.

v1,3 1 0, 1 63. melma July 15, i919 2 SHEETS-SHEET l.

-lTo all fwltowil it may concern.'

STATES PATENT OFFICE ENUD XNUnsEN, or PLAINVILLE, CONNECTICUT, AissIGNon, 'ro THE '.mUlSIEULL ELECTRIC nre. Cc., or rLAINvILLE, CONNECTICUT, A ConPoEA'rIoN 'or coN- N ECTICUT.

INCLosED SWITCH.

`s1 eia`ation of Letters Patent. Patented July 15, 1919, l y l* Application ledl'ugust 22,1918. Serial No. 250,969.

'Bev 't known that I, KNUD KNUDsEN, a subject of the King of Denmark, vwho have signilied my intention ofbecoming a citizen of the United States of America and have taken out first paez-s and applied for second, residing in lainville, Connecticut, have invented a new and useful Inclosed'Switch, of which the following is a specification.

My invention relates to switches of the inclosed or protected type and has forits object the rovision of simple and practical interloc ing mechanism for preventing opening of the switch casing when the swltch is closed and for preventing closing of theA switch when the switch casing is open.

A further object is the provision of vinterlocking mechanism of this character adapted to be used interchangeably in either doublethrow orsingle-throw switches.

According .to my invention the cover of the switch ca sin 1s normally locked closed by mea-ns of a' ockin' lever'fwhich makes engagement` with 'a loc 'ng disk'carrled'by the handle or switch operating device, said locking disk havin tion for holdingthelever interlocked with the cover andv a recessed portion providing a f 'locking 'shoulder with whih'the lever can a simple straight lever en age to lock tlieswitch inoperative. vThe loc'flring lever is preferably 1n the form of pivoted intermediate its endsand havingv a] ook at one end for engagement with ther track and 'locking' shoulder onl the locking disk and a hookv at l its opposite endfor engagement with alocking element on the cover, `said `lever'.furthermore'having anabutment surface whichfwill be engaged by the cover-carried element 'in the closing movement ofthe coverto rock the lever andby one and the same movement toV unlock thelever from the locking washer and interlock the leverv with the coverfcarried Other features 'of the invention will appearas the'spe'cificaton proceeds.

In the accompanying drawings I have concrete and cover loc ed closed.

a so-called track porpractical form, it-being understood however, that the precise form of the invention may. be varied without departure tfrom the true spirit and scope ofthe inven- 1on. In these drawing's- Figure 1, is a front View of the three-pole double-throw inclosed switch havin the features of the invention incorporatef therein, the cover of the switch casing being open in this view and the switch being locked in thel intermediate or neutral position, parts being 60,

shown broken away and in section.

Fig. 2, is an enlarged sectional view taken lsubstantially on the plane of the line 2-2 in Fi 1 showing the switch o erating means ocked and the cover release and in the act of being opened, certain parts being broken away.

Fig. 3, is a, similar View showin the switch o rating means unlocked an the-fl The box o r switchcasin'g 5 is shown made up'of sheet metal as customary in this art yand is provided with a hinged cover 6.

.The switch illustrated is of" typical '0011-' struction embodying a series of three doublearmed switch blades 7 pivoted at Son the switch base 9 andl adapted when rocked in reverse directions to, be engaged with one set or the other of the contact clips 10 and4 11. This switch may be secured Awithin* the casingas by means of the screws 12 passed through the insulating switch base 9 into'en- Y gggeinent with the back. or rearwall of the x. y l

` Thev operating means for the switch is shownin the form. of a hubportion 14 pivoted 'the' casing and with which is .15, saidrod havin ing thecross bar. 1 w ich connects the sev- 90 handle 13 having a in the Side wall of engaged a rod a ortion i 16 over-standeralfswitch blades and connected with said.

' co'ssbar in the present instance through the 'instrumentality ofthe. quickfbreak-springs 18 and. the lost-motion? connection. arms Y 1 9 u 'standing'vfrom'the crossbar and dis 95 -pose atcpposite sides of the operating arm I or lug.32"carriedby the dependent rimportion 3 3 of the, cover. The' vlmlding jaw" 30 tion of the handle V'by means of anjintegral the medium of the connections described, im-

parts a positive movement tothe movable switch element -when the lostmotion between the operating arm 16 and abutments 19 is taken up and the springs 18 serve to impart a 1 quick break movement to the movable switch element in the act of opening the circuit.'

`Carried by the switch operatin means is-V an'element 1n the nature' of a loc ing disk, the same being here shown asa separately.

-;locking lever is prevented by means of the formed disk 20X fastened upon'thef hub porinwardly7 projecting ke responding keyway 22 Other means ofsecuring'this lockingfdisk on, the Vhub kof the'handle may beutillzed if found more desirable. vOne or aseriesof 21 engagedin acor-V spacing washers 23 may be laced on the hub between the point where't e; rod 15 is'en gaged therewith and the locking disk to hold with a track or raised portion-24 terminat-v ing element'in the closing l cover and-form ameans v will be rocked to thepin32'. i- Y A- The locking leven-may bemounted in a suitabl'e housing ll'secured to the side of the 'switchcasing and lthis-housing with' fthe ad `v 55jacent side Wall of :the switch casing are` pin 32. f

vshown as a the disk 'properly positioned against the Side wall of the box." .The lockingy diskis formed ing Vin a notch or recess 25 providing vspaced locking shoulders 26.. f

27 designates the'.

` substantially straight; simple lever ivoted intermediate its ends at 28 and provid) notch 25. [This lever is shown slotted in the upperend corner portion thereoion an incline to thelo ditudinal axis of'lthelever 4jaws to receive between them the-locking pin which over-stands 'the albutm'ent jawr 31 is of lesser-extent thansaid abutment jaw or l in other words, the .abutment jaw. projects beyond the endY of theholding-jaw so that i-t will be engaged by the' cover-carried lockmovement of' the y which 'the lever shown slotted t' to the locking The lockingv lever upon-bye` spring, shown as a hairpin spring, support 37-1and 33,"

at 36l and having spacedarms" one'i'of them bearingfagainst a fixed abutment, such as the wallv of the; housing 34, f

and the other bearing upon" .the locking/leven This spring is shown as engagingjthc locking lever at a point below the pivot thereof?l formed 1n said hubf locking lever whichv is ed at its lower-.end with a hook or. t'ooth29 adapted .to ride .on the raised track 24 of the locking disk .and ,to drop into the carryv the. holding jaw-.over locked" in such inactive. condition.. e

locking s oulder of the locking washer.

1 The operation, itis believed, willbe clear from the foregoing. In the position indicated in Fig. 3` the hook .at the upper or outerV end ofthe lockinglever is engaged over the cover-'carried' element .and the cover lis" thereby 'lockedjclosed lRelease of the v engagement of thejrais/ed track portiony 24 'with the hookonv the lower end of the lever. When however,y the switch ropera-ting handle isfthrownto-carrythe movable switch ele- `mentlto theneutral or inoperativeposition thecover can lthen bev opened, the llfting of theA cover simply .serving'to-rock the hook on thenpper end of the lever freeof the locking 'pin- 32, the hook at the lower end of thelleverat this-time dropping into the i notch 25 in'- thel locking washer. l.By this' engagementof' the-hookon the lower end of the lever in'betweenthe locking shoulders, the switch operating 'means is `posi-` tively locked 'and c'annot'-:be voperated in either direction and this `remains the case so long as'the cover visiopen;y Inl the closing movement of the cover thepin 32 carried by the cover first enga-ges the-falbutmentjaw 31 at the upper end of the lever,;which serving asv an inclined cam,' "causes the lever to be rocked: in .a direction-'t0 carryv the locking jaw 30 over the top ofthelocking pin and to free the hook.' 29 fromv the locking shoulders of the disk (seerstxFig. 2 andthen 3). "The switch'isnow free'to be operated and 'as soon as it is operated in either direction the raised track portion 24 thereof. 105 vby engagement with'thehook 29 will secure the lever Yin'the'positionindicated in Fig. 3' :with: the cover locked closedQi '".With the i coverflocked closed, the switch isfree to' bef. operated in :either or 'both directions and thel cover. canijonlybe'openedwhen; the switch is Vin theintermediate inactive p'osition. Also the "cover cannotbeo'penedevenV in this Vposition Vuntilthe switch becomes With double-throw.. switches 'i Smyth-@inhammen bei lfd-,ageing nieve thatthe locking'disk maybesuited t0 either.

,double-throw Aor single-throw switches, I have shown the locking disk formed with a .single locking shoulder 26 disposed suboperating with 'the locking lever to prevent clrcuit-closig movementof a 'single4throw' I Clanllllfi A -1,.'InA an inclosed switch, a switch casingprovidedv 'with fa movable cover, a switch 'in said casing-'having amovable switch element, switch operati means, a locking disk carried by said sw1 h operatingr means provided'with a -ftrack terminating in 'an abrupt .locking shoulder, a vv'substantially straight lever'pivoted intermediate its ends in thecasing and provided with ya hook at Y one end tofengage -with the lockin shoulder and top bear upon the 'trackl a oresaid, a' locking. 'element carried by the cover, a-

hook on the opposite end of the llever adapted to be held engaged over the covercarrled l element when the 'first' mentioned hook is in engagement with the track aforesaid and an abutment surface on the lever adapted for engagement bythe cover-carried element to rock thelever :and to carry the/hook thereon outof engagement with the locking shoulder. Y

2. In an inclofsed switch, a casing provided with a-movable cover, a switch in the casing havin av movable switch element, switch operat1n'g'means,a locking disk carried by said switch operating meansv proi vided with a track terminating in anabrupt locking shoulder, .a locking element on the cover, a locking lever pivoted intermediate its ends in the casing and provided at its opposite ends with hooksv extending both to-v `ward the same side lof the lever, a spring acting to rock the lever to hold the hoo Aat one end thereof engaged with the locking disk and `thel hook atthe opposite end thereof free' of the'cover-carrie'cl element and an abutment surface. on-the lever enga' eable by the'y cover-carried element to roc the lever against the tension of said spring. ,j

3. In an inclosedswitch, alswitch casin provided wtha movable cover, a switc in said casing 'having a movable switch Aelement, a ,switch operating handle having a'. hubI portion journaled in the casing, a .lock' ing disk on said huband provided ,with a track and an abrupt locking shoulder,a1ockl ing element on the cover and a' 'pivoted lock-V ing device having `hooks for en agement with said track and 'locking shou der, and with the cover-carried locking element respectively, said locking disk being reversibli 'connected with thehubwhereby said dis may be mounted on the hubwith the lock-g f into ing having `air of locking shoulders, A,iiever having la hook for engagement .with `the single locking shoulderor between the .pair o carried by the cover and locking 'the' lever for coperation therewlt ing shoulder thereon in different relations to the pivoted locking device.

V4. An gin'closed switch comprising a box provided-'with a hinged cover, a switch 'mounted on the bottom of said box, a switch operatingA handle 'journaled in'the box, a

shouldered locking disk connected with said terlocking engagement with the locking pin on the cover, a sprin for urging the shouldered lower end o the locking lever into' engagement with the shoulder on the locking dlsk, and a track on said locking disk engaging the shouldered .lower end of the locking lever to hold the same rocked osition with the catch on the upper end t ereof interlocked with the -locking pin on the cover.

5; In an inclosed switch, a casingv provided with a movable cover, a switch in said casing having a movable `switch element, operating means forv said vmovable switch element, a'locking disk` carried by said operating jmeans provided with a track terminating in an Aabrupt locking shoulder, a locking element carried by the cover, a locking lever pivoted the casing and provided with a hook at one end for engagement with the track'and locking shoulder aforesaid and a hook at its opposite end for engagement carried locking element, a relatively stationary abutment, a two-armed hairpin a casing provided with a movable cover,

a switch in said casa movable' switch element, a switch o erating4 member connected with the mova le 'switch element, a locking disk reversibl enga ed 'with said switch operating member an provided with a single locking shoulder and with a pair of spaced locking shoulders substantially oppositely disposed, said disk further havin a track between the single locking shou der and the a pivoted lockingv locking shoulders, according as to owl the diskI 1s positioned with res ect to the oper tting member, a locking e ement Q7. 'In combination, a switch'casing prolvided'with-a mdvable'cover, ai double-throw switch mounted in said casing, an operat.

intermediate its ends inv with the ccvermeans on ing handle for seid double-throw switch, un 'track and to drop into the notch thcieinto locking disk carried by said handle having lock the operating handle against movef atrack provided with anotchtherein, alockment in both directions, the dropping of 10 ing element carried by the cover, a pivoted said hook into said notch being adapted to locking lever having a hook portion for en. free the lever from locking engagement with gagement with said cover-carried locking the cover-carried element. element 'and a hook adapted to bear on the v KNUD KNUDSEN. 

